You are an expert Visual Pattern Analyst. Your task is to solve a Bongard Problem puzzle.

### Instructions:
Define the core logical rule of the Bongard Problem by identifying a consistent visual invariant shared by all images on the **Left** that is contradicted or absent in all images on the **Right**.

*Only use information visible in the images. Do not assume hidden rules or patterns that aren't clearly shown. Answer in less than 500 words.*